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CN102052607A - Backlight unit - Google Patents

Backlight unit Download PDF

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Publication number
CN102052607A
CN102052607A CN2010102581701A CN201010258170A CN102052607A CN 102052607 A CN102052607 A CN 102052607A CN 2010102581701 A CN2010102581701 A CN 2010102581701A CN 201010258170 A CN201010258170 A CN 201010258170A CN 102052607 A CN102052607 A CN 102052607A
Authority
CN
China
Prior art keywords
lgp
back light
light unit
main body
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2010102581701A
Other languages
Chinese (zh)
Other versions
CN102052607B (en
Inventor
金根永
朴钟辰
李政宪
崔善
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung LED Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung LED Co Ltd filed Critical Samsung LED Co Ltd
Publication of CN102052607A publication Critical patent/CN102052607A/en
Application granted granted Critical
Publication of CN102052607B publication Critical patent/CN102052607B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133601—Illuminating devices for spatial active dimming
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133628—Illuminating devices with cooling means

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

There is provided a backlight unit. The backlight unit is configured to include: a plurality of light sources; a plurality of light guide plates being arranged alternately with the light sources so that light emitted from the light sources is incident; and a chassis receiving the light sources and the light guide plates, wherein the plurality of light guide plates are disposed to be spaced apart from each other, being symmetrical to each other in order to face the central region of the chassis, a pair of light guide plates opposed to each other on the central region being connected to each other so that the light therefrom is mixed.

Description

Back light unit
The application requires to be submitted on October 27th, 2009 priority of the 10-2009-102234 korean patent application of Korea S Department of Intellectual Property, and the open of this application comprises therewith by reference.
Technical field
The present invention relates to a kind of back light unit, more particularly, relate to a kind of by adopting the LED packaging part to can be used in the back light unit of the illumination of display unit as light source.
Background technology
Recently, use various types of image display devices, in these image display devices, can consider mainly to use LCD (LCD).
LCD has been applied to the various devices from the monitor of diaphragm type wall hung television, notebook computer, desktop computer, guider, PDA, mobile phone to game machine.The liquid crystal of the display element of composition LCD leans on self can not be luminous, and only be used for coming transmission or stopping light according to the signal of telecommunication that is applied to liquid crystal.
Therefore, for demonstration information on liquid crystal panel, the surface light-emitting device (that is back light unit) from rear portion irradiating liquid crystal panel should be set separately in LCD device.Above-mentioned back light unit should be by improving light brightness and form uniform surface light source light be transmitted into liquid crystal panel equably, thereby can regard back light unit as very important aspect the product quality.
Because image display device has become bigger and thinner recently, and has than past model more performance, so can realize local dimming (local dimming) with thin thickness.Therefore, studied energetically to be implemented in the backlight of excellent images quality is provided in the large-scale LCD.Under the situation of large-scale LCD,,,, thereby reduced the overall brightness uniformity so brightness step is inhomogeneous so that they are set to along sense is luminous because a plurality of LGPs are provided with abreast.
In addition owing to produce bright line or concealed wire, so definition reduce, thereby cause the thickness of LGP need increase or need the problem of additional processing special pattern.
In addition, following variety of issue occurs: the lost of life and definition at boundary member when carrying out local dimming reduce, thereby produce difficult point on stream.
Summary of the invention
An aspect of of the present present invention provides a kind of like this back light unit, described back light unit has simple structure and can carry by preventing on big screen LCD to produce bright line and concealed wire comes high brightness and brightness uniformity, thereby can promote clearness and obtain more distinct image quality.
According to an aspect of the present invention, provide a kind of back light unit, described back light unit comprises: a plurality of light sources; A plurality of LGPs are alternately arranged with light source, make to be incident on the LGP from the light of light emitted; Underframe holds light source and described a plurality of LGP, wherein, described a plurality of LGP is set to separated from one another and is mutually symmetrical, with the central area in the face of underframe, a pair of LGP respect to one another is connected to each other on the central area, and feasible light from described a pair of LGP mixes.
In addition, the LGP that is arranged on the central area can comprise: optical receiving surface, and on a side surface of LGP, light is incident on the optical receiving surface; Another optical receiving surface, relative with described optical receiving surface and on the opposite side surface of LGP, make a pair of optical receiving surface be mutually symmetrical, and between this is to optical receiving surface, have the central area of LGP.
In addition, a plurality of light sources can be transmitted into light the central area direction of underframe respectively.
In addition, light source can comprise: substrate flatly is provided with on the basal surface of underframe and has a wiring; A plurality of LED packaging parts are installed in the substrate vertically, make led chip face the optical receiving surface of LGP.
In addition, the LED packaging part can comprise lead terminal, and lead terminal is electrically connected to wiring and is installed in the substrate by described side surface along the side surface of main body.
In addition, lead terminal can comprise: first lead-in wire, and all flatly outstanding along minor axis direction to the rear surface of main body from the side surface of main body; Second lead-in wire, crooked vertically extending to the front surface of main body from an end of first lead-in wire, and have an end that bends to the side surface of main body along major axes orientation vertically.
In addition, second lead-in wire can be formed along minor axis direction parallel with the side surface of main body, and parallel with the side surface of main body along major axes orientation, thereby integral body has " L " shape structure.
In addition, in light source, described a plurality of LED packaging parts can be arranged in the bar shaped substrate, make to be arranged on each led chip on described a plurality of LED packaging part towards identical direction.
In addition, LGP also can be included in the reflecting layer on the side section relative with optical receiving surface.
Back light unit also can comprise on the top that is arranged on LGP and receive the optical sheet of light in addition.
According to a further aspect in the invention, provide a kind of back light unit, described back light unit comprises: a plurality of light sources; A plurality of LGPs are alternately arranged with light source, make to be incident on the LGP from the light of light emitted; Underframe, hold light source and LGP, wherein, described a plurality of LGP is set to separated from one another and is mutually symmetrical, with central area in the face of underframe, the light source that is separately positioned between LGP and another LGP in described a plurality of light source is transmitted into LGP on the both sides adjacent one another are with light, makes mixed from the light of LGP.
In addition, the light source between the side section of the optical receiving surface of the LGP adjacent with each light source and another LGP in described a plurality of light source can be transmitted into light described optical receiving surface and described side section both direction.
In addition, light source can comprise: substrate flatly is provided with on the ground surface of underframe and has a wiring; A plurality of LED packaging parts are installed in the substrate vertically, make the optical receiving surface of led chip towards LGP.
In addition, the LED packaging part can comprise: lead terminal is electrically connected to wiring and is installed in the substrate by described side surface along the side surface of main body.
In addition, lead terminal can comprise: first lead-in wire, and all flatly outstanding along minor axis direction to the rear surface of main body from the side surface of main body; Second lead-in wire, crooked vertically extending to the front surface of main body from an end of first lead-in wire, and have an end that bends to the side surface of main body along major axes orientation vertically.
In addition, second lead-in wire can be formed along minor axis direction parallel with the side surface of main body, and parallel with the side surface of main body along major axes orientation, thereby integral body has " L " shape structure.
In light source, described a plurality of LED packaging parts alternately are arranged in the bar shaped substrate, make be arranged on described a plurality of LED packaging part corresponding led chip towards direction and with adjacent led chip towards direction change 180 °.
In addition, the light source alternately arranged of a plurality of LED packaging parts can be set on the borderline region of LGP adjacent one another are.
In addition, back light unit also can comprise on the top that is arranged on LGP and receive the optical sheet of light.
Description of drawings
By the detailed description of carrying out below in conjunction with accompanying drawing, above-mentioned and others of the present invention, feature and other advantage are understood with will be more readily apparent from, wherein:
Fig. 1 illustrates the perspective view of back light unit according to an exemplary embodiment of the present invention;
Fig. 2 is the vertical view that back light unit shown in Figure 1 is shown;
Fig. 3 A is the perspective view of front surface of LED packaging part that the light source of the back light unit shown in the composition diagram 1 is shown;
Fig. 3 B is the perspective view that the rear surface of the LED packaging part shown in Fig. 3 A is shown;
Fig. 4 is the perspective view that the light source with following structure is shown, that is, all are set to towards identical direction with the LED packaging part shown in Fig. 3 B at Fig. 3 A;
Fig. 5 is the perspective view that the modification of the back light unit shown in Fig. 1 is shown;
Fig. 6 is the vertical view that the back light unit shown in Fig. 5 is shown;
Fig. 7 is the perspective view that the back light unit of another exemplary embodiment according to the present invention is shown;
Fig. 8 is the vertical view that the back light unit shown in Fig. 7 is shown;
Fig. 9 is the front view that the light source with following structure is shown, that is, Fig. 3 A alternately is set to have different light emission directions with the LED packaging part shown in Fig. 3 B;
Figure 10 is the perspective view that the modification of back light unit shown in Figure 7 is shown;
Figure 11 is the vertical view that the back light unit shown in Figure 10 is shown.
The specific embodiment
Describe the exemplary embodiment of the present invention that relates to back light unit in detail now with reference to accompanying drawing.
Exemplary embodiment of the present invention can be with multiple multi-form making amendment, and scope of the present invention should not be limited to embodiment set forth herein.On the contrary, provide these embodiment to make that the disclosure will be completely and completely, and will convey to those skilled in the art to design of the present invention fully.
In the accompanying drawings, for the sake of clarity, can exaggerate shape and size, identical label will be used to represent same or analogous assembly all the time.
Describe back light unit according to an exemplary embodiment of the present invention in detail now with reference to Fig. 1 to Fig. 6.
Fig. 1 illustrates the perspective view of back light unit according to an exemplary embodiment of the present invention, Fig. 2 is the vertical view that back light unit shown in Figure 1 is shown, Fig. 3 A is the perspective view of front surface of LED packaging part that the light source of the back light unit shown in the composition diagram 1 is shown, and Fig. 3 B is the perspective view that the rear surface of the LED packaging part shown in Fig. 3 A is shown.
Fig. 4 is the perspective view that the light source with following structure is shown, promptly, all all are set to towards identical direction with the LED packaging part shown in Fig. 3 B at Fig. 3 A, and Fig. 5 is the perspective view that the modification of the back light unit shown in Fig. 1 is shown, and Fig. 6 is the vertical view that the back light unit shown in Fig. 5 is shown.
See figures.1.and.2, back light unit 1 can be constructed to comprise LGP 10, light source 20 and underframe (chassis) 30 according to an exemplary embodiment of the present invention, and can be constructed to the optical sheet (not shown) that also comprises the top that is arranged on LGP and receive light.
LGP 10 has the plate structure of rectangular shape, and wherein, preferably, optical receiving surface 11 is in the side surface setting of major axes orientation upper edge LGP 10, and light source 20 is arranged on the optical receiving surface 11 so that light incident.
LGP 10 can be made by the transparent resin such as PMMA, equably light is guided to inciding on the optical receiving surface 11, wherein, the basal surface of LGP 10 can be formed the special pattern (not shown), uneven pattern etc. for example is so that be reflected onto the top of LGP 10 in the face of the light of the bottom of LGP 10.In addition, LGP 10 also can be included in the reflecting layer (not shown) on the side section 12 relative with optical receiving surface 11.
Underframe 30 is that portion holds and support the framing component of LGP 10 and light source 20 within it.
Underframe 30 is made of emerge 31 and the sidewall 32 that extends to the top of underframe 30 from the profile of basal surface 31, and underframe 30 has the unlimited case type structures of upper surface (or front surface).Preferably, underframe 30 is made by the metal material of considering intensity and radiation efficiency, yet is not limited thereto.
As shown in the drawing, a plurality of LGPs 10 alternately are arranged on underframe 30 inside with light source 20, make can be incident on the LGP from the light of light source 20 emissions, and wherein, the quantity of the LGP of setting can change according to the design size of LCD.
Specifically, a plurality of LGPs 10 are set to separated from one another and are mutually symmetrical, with the central area in the face of underframe 30.
More particularly, by underframe 30 is divided into two underframe 30 is divided into along the LGP 10 in two zones of minor axis direction symmetry and is arranged in each zone, make LGP 10 be mutually symmetrical along the cut-off rule C of central area.
At this moment, the side section 12 relative with optical receiving surface 11 that is arranged on that LGP 10 in each zone is provided so that them is respectively in the face of the central area.
Arrangement by LGP 10 is arranged on light source 20 on the optical receiving surface 11 of each LGP 10 respectively to the central area of underframe 30 direction emission light L.Therefore, compared with prior art (in the prior art, light is launched towards a side surface, make and in the zone corresponding, have high-caliber brightness with side surface, it is inhomogeneous that thereby brightness step becomes), on the central area of back light unit 1, show high-caliber brightness, thus the brightness step symmetry.
This can integrally promote clearness in LCD and realize more distinct image quality.
In the accompanying drawings, be divided into two along minor axis direction, make LGP 10 be set to be mutually symmetrical by side surface with underframe 30.Yet, also can be divided into two along major axes orientation and make LGP 10 be set to be mutually symmetrical by side surface with underframe 30.
As depicted in figs. 1 and 2, when a pair of LGP 10 is set to based on the central area of underframe 30 toward each other and when being mutually symmetrical, the side section 12 relative with the optical receiving surface 11 of each LGP 10 can carry out the surface contact along the cut-off rule C of central area and be connected to each other.
As shown in Figure 5 and Figure 6, when single LGP is set on the central area of underframe 30, make when cut-off rule C is positioned at the center of LGP 10, LGP 10 can be included on the one side surface optical receiving surface 11 with at its opposite side lip-deep another optical receiving surface 11 relative with described optical receiving surface 11, thereby a pair of optical receiving surface 11 also can be mutually symmetrical, and has the central area and the cut-off rule C of LGP 10 between this is to optical receiving surface 11.
In this case, be arranged on LGP 10 on the central area and on both sides, all have and be set to light source 20 respect to one another, thereby have two light sources 20.
Therefore, mix in the LGP (or by connecting the LGP that a pair of LGP forms) of light on being arranged on the central area, thereby have the symmetrical structure that brightness step increases towards the central area.
Simultaneously, being arranged on light source 20 on the optical receiving surface 11 of LGP 10 comprises substrate 21 and is installed in a plurality of LED packaging parts 22 in the substrate 21.
Substrate 21 comprises the wiring (not shown) that is electrically connected to LED packaging part 22, wherein, substrate 21 can have with LGP 10 along the corresponding whole strip structure of the length of major axes orientation.
It is level that substrate 21 can be set up and be installed as on the basal surface 31 of underframe 30.Therefore, substrate 21 increases with the contact area of underframe 30, is transmitted to underframe 30 with permission by more heat that LED packaging part 22 produces, thereby can improves radiation efficiency.
In LED packaging part 22, the led chip 24 that is arranged on main body 23 inside is installed in the substrate 21 vertically, with the optical receiving surface 11 in the face of LGP 10.
Describe the structure of LED packaging part 22 in detail now with reference to Fig. 3 A and Fig. 3 B.
As shown in the figure, in LED packaging part 22, the main body of being made by silicon or pottery 23 has rectangular shape, is exposed to outside spatial accommodation and is formed on the front surface 22a of main body 23, so that led chip 24 is installed on the spatial accommodation.
Spatial accommodation can be filled by transparent sealing member 26, thus protection led chip 24, wherein, containment member 26 can comprise phosphor, thus conversion is from led chip 24 wavelength of light emitted.
The radiator 27 that passes main body 23 is arranged on the basal surface of spatial accommodation (led chip 24 is installed on the spatial accommodation), and wherein, radiator 27 is exposed to the outside by the rear surface of main body 23.Therefore, the heat that is produced by led chip 24 directly is discharged into the outside by radiator 27, thereby can improve radiation efficiency.
In addition, the side surface along main body 23 is provided with the lead terminal 25 that led chip 24 is electrically connected to the wiring (not shown).
More particularly, lead terminal 25 comprises: the first lead-in wire 25a, and all flatly outstanding along minor axis direction to the rear surface of main body 23 22b from the side surface of main body 23; The second lead-in wire 25b, crooked vertically extending to the front surface 22a of main body 23 from the end of the first lead-in wire 25a, and have an end that bends to the side surface of main body 23 along major axes orientation vertically.
In addition, the second lead-in wire 25b is connected to the first lead-in wire 25a becoming integral body, and be formed along minor axis direction parallel with the side surface of main body 23, and parallel with the side surface of main body 23 along major axes orientation, thereby integral body has " L " shape structure.
Therefore, its side surface (more particularly, being provided with the side surface of the second lead-in wire 25b along its of major axes orientation) that is provided with lead terminal 25 is mounted to towards substrate 21, makes LED packaging part 22 be installed to vertically in the substrate 21.
At this moment, radiator 27 is provided with the second lead-in wire 25b and outstanding along the side surface of major axes orientation from its of main body 23, makes radiator 27 flatly to be arranged on the side surface of main body 23 along major axes orientation with the second lead-in wire 25b.
Therefore, when main body 23 is installed, radiator 27 contacts with substrate 21 together with the second lead-in wire 25b, also therefore has stable mounting structure with the installing space that broad is provided, the heat energy that is produced by led chip 24 enough is delivered to substrate 21 by radiator 27, thereby can obtain the effect that radiation efficiency increases extraly.
As shown in Figure 4, a plurality of LED packaging parts 22 can make each led chip 24 all in the face of identical direction with arranged at predetermined intervals in bar shaped substrate 21.
As mentioned above, unlike the prior art, LED packaging part 22 and LED packaging part 22 structure that is installed in substrate (the sole level land is installed on the underframe 30) vertically can reduce the thickness of light source according to an exemplary embodiment of the present invention, therefore also can reduce the size of the borderline region between the LGP 10, thereby can solve the problem that definition reduces.
Describe back light unit according to another embodiment of the present invention in detail now with reference to Fig. 7 to Figure 11.
Fig. 7 is the perspective view that the back light unit of another exemplary embodiment according to the present invention is shown, Fig. 8 is the vertical view that the back light unit shown in Fig. 7 is shown, Fig. 9 is the front view that the light source with following structure is shown, that is, Fig. 3 A alternately is arranged as with the LED packaging part shown in Fig. 3 B and has different light emission directions.Figure 10 is the perspective view that the modification of back light unit shown in Figure 7 is shown, and Figure 11 is the vertical view that the back light unit shown in Figure 10 is shown.
Back light unit 1 shown in Fig. 7 to Figure 11 ' structure and the structure shown in the embodiment of Fig. 1 to Fig. 6 basic identical.That is, a plurality of LGPs are set to separated from one another and are mutually symmetrical, with the central area in the face of underframe.
The difference of present embodiment is that the light source that is separately positioned between a LGP and another LGP in a plurality of light sources is transmitted into LGP on the both sides adjacent one another are with light, makes that the light from this LGP mixes.Therefore,, and difference structure among the embodiment of Fig. 7 to Figure 11 will be described emphatically with the description of omitting to the essentially identical structure between Fig. 1 to Fig. 6 and Fig. 7 to Figure 11, that is, and light source.
As shown in Figure 7 and Figure 8, when a pair of LGP 10 is set to based on the central area of underframe 30 toward each other and when being mutually symmetrical, light source 20 can be arranged on along between the cut-off rule C of the central area side section 12 respect to one another, with in the face of the side section 12 relative with the optical receiving surface 11 of corresponding LGP 10.
At this moment, the light source 20 that is arranged on the center has the structure of alternately arranging by the direction that changes front surface 22a (light-emitting area of LED packaging part 22), light L is transmitted into the both direction that is mutually symmetrical.
More particularly, as shown in Figure 9, a plurality of LED packaging parts 22 alternately are arranged in the bar shaped substrate 21, make alternately 180 ° in the direction that direction that led chip 24 is faced and another led chip 24 that is adjacent face.
Except according to the embodiment of Fig. 1 to Fig. 6 only along the direction luminous light source 20, these light sources are along both direction emission light L, thereby can be luminous along both direction.
Therefore, light is in incident on the optical receiving surface of LGP and on the side section and mix, and makes brightness become even on whole LGP.As a result, can solve effectively owing to its of LGP 10 is provided with the shortcoming that brightness uniformity that near the optical receiving surface 11 of light source 20 brightness and the difference between the brightness around the side section 12 relative with optical receiving surface 11 causes reduces.
In addition, can on whole LCD, obtain more distinct image quality.
Specifically, when in big screen LCD, LGP 10 being divided into a plurality of districts and each piece district carried out local dimming, stoped on borderline region, to produce concealed wire, made it possible to obtain more distinct image quality.
Simultaneously, as shown in Figure 10 and Figure 11, when single LGP 10 is set on the central area of underframe 30, make when cut-off rule C is positioned at the center of LGP 10, the light source 20 that all is arranged on two side surfaces of LGP 10 can have the structure that light L is transmitted into both direction, as shown in Figure 7.
Specifically, have light source 20 that a plurality of LED packaging parts 22 alternately are arranged as the structure with different light emission directions and be arranged on the borderline region between the LGP adjacent one another are, make light source 20 light is transmitted into the optical receiving surface and the side section of two LGPs 10.
In addition, 20 optical receiving surfaces 11 that light need be transmitted into LGP 10 of light source along the sidewall 32 of underframe 30 is provided with make it possible to use each LED packaging part that makes that has as shown in Figure 1 to be arranged as towards the light source of the structure of identical direction.
As mentioned above, according to exemplary embodiment of the present invention, can be provided with brightness step more even, even thereby in being furnished with the big screen LCD of a plurality of LGPs separated from one another, also brightness and brightness uniformity can be improved, thereby the distinct image quality can be promoted clearness and obtain.
In addition, simplified the structure of LGP, thereby can be easy to make LGP and shorten its manufacturing time.
Though illustrated and described the present invention in conjunction with exemplary embodiment, it will be understood by those skilled in the art that do not breaking away under the situation of the spirit and scope of the present invention that limit as claim, can make amendment and change.

Claims (19)

1. back light unit comprises:
A plurality of light sources;
A plurality of LGPs are alternately arranged with light source, make to be incident on the LGP from the light of light emitted;
Underframe holds light source and LGP,
Wherein, described a plurality of LGPs are set to separated from one another and are mutually symmetrical, and with the central area in the face of underframe, a pair of LGP respect to one another is connected to each other on the central area, and feasible light from described a pair of LGP mixes.
2. back light unit as claimed in claim 1, wherein, the LGP that is arranged on the central area comprises: optical receiving surface, on a side surface of LGP, light is incident on the described optical receiving surface; Another optical receiving surface, relative with described optical receiving surface on the opposite side surface of LGP, thus a pair of optical receiving surface is mutually symmetrical, and between this is to optical receiving surface, have the central area of LGP.
3. back light unit as claimed in claim 1, wherein, described a plurality of light sources are transmitted into light the central area direction of underframe respectively.
4. back light unit as claimed in claim 1, wherein, light source comprises:
Substrate flatly is provided with on the basal surface of underframe and has a wiring;
A plurality of LED packaging parts are installed in the substrate vertically, make led chip face the optical receiving surface of LGP.
5. back light unit as claimed in claim 4, wherein, the LED packaging part comprises lead terminal, lead terminal is electrically connected to wiring and is installed in the substrate by described side surface along the side surface of main body.
6. back light unit as claimed in claim 5, wherein, lead terminal comprises: first lead-in wire, all flatly outstanding along minor axis direction to the rear surface of main body from the side surface of main body; Second lead-in wire, crooked vertically extending to the front surface of main body from an end of first lead-in wire, and have an end that bends to the side surface of main body along major axes orientation vertically.
7. back light unit as claimed in claim 6, wherein, second lead-in wire is formed along minor axis direction parallel with the side surface of main body, and parallel with the side surface of main body along major axes orientation, thus integral body has " L " shape structure.
8. back light unit as claimed in claim 4, wherein, in light source, described a plurality of LED packaging parts are arranged in the bar shaped substrate, make to be arranged on each led chip on described a plurality of LED packaging part towards identical direction.
9. back light unit as claimed in claim 1, wherein, LGP also is included in the reflecting layer on the side section relative with optical receiving surface.
10. back light unit as claimed in claim 1, described back light unit also comprise on the top that is arranged on LGP and receive the optical sheet of light.
11. a back light unit comprises:
A plurality of light sources;
A plurality of LGPs are alternately arranged with light source, make to be incident on the LGP from the light of light emitted;
Underframe holds light source and LGP,
Wherein, described a plurality of LGP is set to separated from one another and is mutually symmetrical, with central area in the face of underframe, the light source that is separately positioned between LGP and another LGP in described a plurality of light source is transmitted into LGP on the both sides adjacent one another are with light, makes mixed from the light of LGP.
12. back light unit as claimed in claim 11, wherein, the light source between the side section of the optical receiving surface of the LGP adjacent with each light source and another LGP in described a plurality of light source is transmitted into described optical receiving surface and described side section both direction with light.
13. back light unit as claimed in claim 11, wherein, light source comprises:
Substrate flatly is provided with on the ground surface of underframe and has a wiring;
A plurality of LED packaging parts are installed in the substrate vertically, make the optical receiving surface of led chip towards LGP.
14. back light unit as claimed in claim 13, wherein, the LED packaging part comprises: lead terminal is electrically connected to wiring and is installed in the substrate by described side surface along the side surface of main body.
15. back light unit as claimed in claim 14, wherein, lead terminal comprises: first lead-in wire, and all flatly outstanding along minor axis direction to the rear surface of main body from the side surface of main body; Second lead-in wire, crooked vertically extending to the front surface of main body from an end of first lead-in wire, and have an end that bends to the side surface of main body along major axes orientation vertically.
16. back light unit as claimed in claim 15, wherein, second lead-in wire is formed along minor axis direction parallel with the side surface of main body, and parallel with the side surface of main body along major axes orientation, thereby integral body has " L " shape structure.
17. back light unit as claimed in claim 13, wherein, in light source, described a plurality of LED packaging part alternately is arranged in the bar shaped substrate, make be arranged on described a plurality of LED packaging part corresponding led chip towards direction and another led chip adjacent with corresponding led chip towards direction change 180 °.
18. back light unit as claimed in claim 17, wherein, the light source that described a plurality of LED packaging parts are alternately arranged is set on the borderline region of LGP adjacent one another are.
19. back light unit as claimed in claim 11, described back light unit also comprise on the top that is arranged on LGP and receive the optical sheet of light.
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KR101662487B1 (en) 2016-10-17
US20140009911A1 (en) 2014-01-09
US20110096528A1 (en) 2011-04-28
EP2322963A1 (en) 2011-05-18
US8727600B2 (en) 2014-05-20
US8545086B2 (en) 2013-10-01
KR20110045595A (en) 2011-05-04
JP2011096634A (en) 2011-05-12
JP5745797B2 (en) 2015-07-08
EP2322963B1 (en) 2019-12-11

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